x1, x2, x3, x4, x5, x6, x7, x8, x9, y10, y11, y12, y13, y14, y15, y16, y17, y18, y19 
0
x1*y11+x2*y12+x3*y13+x4*y14+x5*y15+x6*y16+x7*y17+x8*y18+x9*y19+y10,
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